He thought he saw someone walking up the stairs, moving out of sight just before John could properly look. "This is excactly the part where the sidekick goes up the stairs, meets the ghost and gets killed. Well, if this was a movie anyway."

"This is a dream, a nightmare", he could barely hear himself over his pounding heart. Sherlock shook his head gently, standing up and walking forward, giving John a better view on his cracked skull. He was still smiling as he leaned over the ex army doctor, licking his lips slowly. "Only if you believe it to be."